Gear case



Aug. .30; 1932. Q Q FE 1,874,905 I GEAR CASE Filed Sept. 22, 1928 3Sheets-Sheet 1 Aug. 30, 1932. o. COFFEY 1,374,905

' GEAR CASE Filed Sept. 22. 1928 s Sheets-Sheet 2 II l iilmnnnul"lllllllllll 0. L. COFFEY Aug. 30, 1932.

GEAR GAS E Filed Sept. 22, 1928 I l l I i l I I IIZZZ'LI:

Patented Aug. 30, 1932 p osoAn stormy. or mnvEY nnINoIs, AssIGNoR "nownrrrne CORPORATION, or nsnvnmrnnmors,Aoonrommon OF ILLINOIS i v. V F

GEAR cAsE,

a lication filed September 22,1928. f s riai in). 301657.

Theinvention-relates to gear cases. In cases for gearing, such, forexample, as the cases used in trolleys on'cranes, .it-has been founddesirable to fabricatethe structure, so far as possible, of wrought orplate metal, and one object of the invention is-to provide an improvedgear case which is fabrie cated of plate metal and in which the gearingis carried or journalled in a supplemental cast frame whichcan-'be'readily machined before it is inserted-into the case, and sothat the shell forming the case will not require. any machining,

Another object of the invention is to provide an improved gear-casestructure in which the shell is fabricated of plate metal and isprovided with a castframe in'which the gearingismounted or journalled. ia

Other objects =of the'invention will be apparent from a considerationof-the following detaileddescription; I

The invention consists in-the several novel features hereinafter setforth and more particularly defined by claims at the conclusion hereof.5 Q

In the drawings which: accompany and form a part of this specificationor disclosure and in which like numeralsof'reference denotecorresponding parts thro'ughoutthe several views: Fig. 'lis a sideelevation of a crane trolley or truck embodying the invention.

Fig. 2 is a plan, the cover of the gear case being removed. Fig. 3 isasection taken on I the line 33 ofFig. 1. Fig. l is a perspective of thelower-section 0f thegear-case. Fig. 5 is a perspective of the supportingframe for the gearing separated-from the case. Fig. 6 is a section takenon the line 66 ofFig. 1.

Fig. 7 is a section taken on the line 77 ofFig.l. H

The gear case'which forms'the subject mat- -ter of the invention isexemplified in connection with the truck frame of a trolleyfor' a crane.Thetruekframe is composed of a base 6, underlying cross-beams 5, andbrace and tie bars 7. @Bearing brackets 8 are securedto the frame,andwheels 9ghave their axles journalled in said'brackets- Thebase Y 6 iscomposedof a platefi at the side thereof, I

over which the gearing for driving thehojisting drum'Qismounted,and'iwhich'forms the i J bottom of 5 the case for said gearingand'a centraltransverseplate 6 f A mountlng plate 12'for a motor 13 forpropelling the truck overlaps and is secured to portions of plates 6 and6 The's'e plates are welded. to the beams 5-to form a rigidstructure. *Amotor for operating a hoisting drum 15" through suitable gearing, ismounted on plate- 6 lhe gearing forjdriving" the hoistingfdrum"comprises a shaft 1'6which is driven by the motor through a shaftsection16 and flexible coupling 16 pinion 17 fixed to 'sha t 16;'ja gear18meshing'withpinion 17 asha'ft 19 driven by the gear18 through asuitable "load 'brakewhichmay be of'the constructionset forthinanapplication filed by me Septem-.

ber 20,1928, Serial No. 307,372; a pinion 20 fixed'to shaft 19 ;-and agear- 21 meshing-with pinion 20 and fixed'ito the hoisting drum- 15 "Inpracticeit is necessary to, provide'aii'en closing case for thisgearing, which is adapt ed to contain oil for lubricating the gearingand preventing excessive heating of the load this gearf case is composedofplates'which arewelded together so lubricant-will bereta'inedtherein.:=-The plate 6 of the'truck base-forms the bottom of the gear case;Vertical'end plates 23 and'24, and side plates '25 and 26 'areweldedtogether to form'the lower '70 and rotatingwith the shaft 22 for saiddrum. 3 r

brake. fAccordingto'the present' invention section of the gear case.These plates'eX- tend upwardly approximately to theaxisof shafts 16, 19and 22. The top of the caseis "formed by a cover section 30 which isalso ,built up of plateswelded together. An angular bar 31 is secured tothe lower margin of section-30 and has a horizontalfiange 3P adapted torest on the upper edges of'the plates forming the lowersection of thecase 'anda vertical flange 3lt0 lap the outer faces of said platestoforma substantially tight :joint "between the ease-sections.- U-shaped"handles" 32 are secured to the cover. A recess or pocket for one of thetruck-wheels 8 is formed in the 'lower portion of the lower'sectionbfthe case by vertical plates 33jand 33 and a horizontalplate'33 ;The" eet- 'ing edges ofall of the platesfo'rming the V lowersection of the box are welded together,

as at 34, and the Vertical plates are welded to the base plate 6 at toform a rigid rectangular structure. A case frame 36 is mounted in thelower section of the case, and is adapted tosupport the gearing foroperating the drum-15. This frame comprises sides 36 and 36 ends 36 and36, and a crossbar 36 all of which are integrally formed orcasttogethe'r. 'A'spacing and reinforcing plate 38 is welded to theinner face of the plate 26, andispacer and reinforcing plates 39 and 40are welded to the inner face of plate 25. Bolts 37 extend throughtheframesides and boX-sides'a-nd the spacing plates to removably secure theframe 36 in the lower section of the case; This frame is provided withapair of aligned seats 36 to receive the bearings for the shaft 16 whichare heldin the seats by caps 41; a pair of aligned seats 36 to receiveorform bearings for the shaft 19, and a seat .36? to receive or form abearing for the shaft 22of the hoisting drum. Caps 42 are adapted tosecure the shaft 19 in the frame. Plate 26 is formed with a semicircularopening 26, through which the hoisting drum 15 extends. Side 36 of frame36 is formed with'an opening 36; for. the drum. A semi-circular groove36 'is formed in the outer face offside 36 of the frame to receive andretain a packing ring 44; around the drum, forthe purposeofpreventing-theescape of lubricant. a V

The frame is machined before it is inserted into the case, and it iscast with an integral cross-bar 36 to rigidly cross-connect the sides ofthe frame and prevent breakage .whilethe frame is being machined. lAfter the frame has been machined and before it is inserted in thecase,the bar 36 is cut away.

The invention exemplifies a case for gearing which is formed of platesof metalwelded together and an inserted frame whic'hcarries thegearing-bearings and canbe machined before it is inserted in the case.The frame forms, a unit which can be removed from the case conjointlywith the gearing, or which permits any of the shafts to be separatelyremoved. The plate metal formation of the case renders it strong anddurable, and makes it possible "to form it asan integral part oftersPatent, is: 1- Y 1. The combinationof a case comprising alower-sectionformed of a bottomplate', side i and end-plates of wroughtmetal welded together and a removable cover section formed of a topplate, side and end plates of wrought metal welded together, the sideand end plates of the cover section being adapted to fit against theside and end plates of the lower:

section respectively, a cast metal frame'disposed in andsecured to thelowersection,and gearing mountedr in theframe and-enclosed by the twosections. 7

f 2. The, combination of a casecomprising a lower section formed of abottom plate, side and end plates. of wrought metal welded together and.a removable cover section, a cast "metal frame disposed and secured tothe .lower section of. the case, plates welded to the inner faces ofthesicl'eplates and arranged to space the framefromsaid side plates,and; gearing mounted in the frame.

3. The combination of ai base comprising a lower section formedfofwrought metal plates weldedtogetheranda removable cover section, arectangular, cast metal frame disposed in the lowersectionof the caseandem-v .bodying sides and ends, spacer-plates for the frame welded tocertain plates of the lower section and positioned so as-to engage thesides of the frame, bolts;extending through the spacer-plates and theframe-sidesfor securing the frame in said lower section of the case, andgearing mounted in the frame. i

4:. The combination of a case comprising a bottom plate,end plates andside plates of .wroughtmetal all welded;together, a cast metal framedisposed, in the case, spaceri ng through the sideand spacer platesforsecuring the frame in the case, and; gearing mcninted in the frame-L,T. .1

-5. The combination ofgan enclosing case comprising a bottom-plate, sideand end plates of wrought metal welded together so {as to form afiuidtight compartmentgfor'retaining'a lubricant, a cast metal frame inthe compartment connected to the case so that it .1s supported; therebyand having bearings machined therein',and gearing mountedin the framesothat it isjlubricated by the lubricant and embodying shafts journalledin the plates welded to the side-pl;ates,,bolts extendaforesaid-bearingsand extendingthrough openings inthe side plates of the case.

7' 6. The combination of'an-enclosingrcase comprising a bottomplate',side and end plates ofwrought metal weldeditogether so as to form afluid tight compartment for retaining a lubricant, a cast metal framedisposed inthe compartment and secured to" the 'side plates of the caseso that it is held in.

spaced relation with respect to the bottomplate, and gearing mounted inthe frame. I

7. The combinationfof an "enclosing case comprising a lower, 1 sectionformed 2 of wrought metal plates rigidly secured. together, andajremovable .cover selction formed of wrought-,m'eta-lplates rigidlysecured together, a cast. metal frame. disposed in and V supportedbythelower; section of the case, and

gearing including a shaft and mounted in the frame, the lower sectionand cover sectionv having complementary openings formed in two of theplates thereof through which the shaft extends. V

8. The combination with a truck embodying a base plate, of an enclosingcase comprising side and end plates of wrought metal rigidly securedtogether, said plates being secured to the base plate of the truck andforming therewith a compartment, a cast metal frame disposed in thecompartment and supported by the case, and gearing mounted in the frame.

9. The combination with a wheeled truck embodying a base plate, of anenclosing case mounted on the base plate and formed of wrought metalplates arranged to form a pocket for one of the wheels of the truck anda fluid tight compartment, a cast metal frame disposed in thecompartment and supported by the case, and gearing mounted in the frame.7

Signed at Harvey, Illinois, this 31st day of May, 1928.

OSCAR L. COFFEY.

